HippoBaro opened a new pull request, #9723:
URL: https://github.com/apache/arrow-rs/pull/9723
# Which issue does this PR close?
- Contributes to #9722
# Rationale for this change
Existing writer benchmarks use narrow schemas (5–10 columns) and primarily
measure data encoding throughput. They don't capture per-column structural
overhead that dominates at high column cardinality (thousands to hundreds of
thousands of columns), such as allocation, and metadata assembly.
# What changes are included in this PR?
This commit adds benchmarks to fill that gap by writing a single-row batch
through `ArrowWriter` with 1k/5k/10k flat `Float32` columns and per-column
`WriterProperties` entries, isolating the cost of the writer infrastructure
itself.
Baseline results (Apple M1 Max):
```
writer_overhead/1000_cols/per_column_props 3.72 ms
writer_overhead/5000_cols/per_column_props 54.96 ms
writer_overhead/10000_cols/per_column_props 220.73 ms
```
# Are these changes tested?
N/A
# Are there any user-facing changes?
N/A
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